A climatic reversal at the last interglacial-last glacial transition recorded in the loess section at Zhaitang, Beijing

A weakly developed paleosol was identified at S1-L1 transition of the loess section of Zhaitang, Beijing. This paleosol may represent a climatic reversal which is associated with the strengthening in summer monsoon and correlated well with the climatic regression event documented in the paleoclimate records from Greenland ice, marine sediments and European pollen at the last interglacial-last glacial transition.     

论后WTO时代制约我国旅游企业发展的自身因素及对策

后WTO时代我国旅游企业的发展前景如何,直接关系着我国整个旅游业的发展.就此问题,从揭示我国旅游企业目前所存在的问题着手,分析了前、后WTO时代我国旅游企业所拥有的不同环境,并提出了要采用的对策及其理由.     

Variations of alkenone temperature in the Sea of Japan during the last 170 ka and its paleoceanographic implications

Two sediment cores, KCES1 and ODP797, which were recovered from the Sea of Japan （JS）, were measured for alkenone-derived sea surface temperatures （U37-SSTs）. Our results revealed that the SSTs closely follow the glacial-interglacial cycles during the last 170 ka, except in the last glacial maximum （LGM）, during which the SST was higher than in the Holocene. The anomalous high temperature in the LGM is considered as an effect of the intrusion of a low salinity water mass into the JS when the sea level was almost below 130 m. On the glacial- K interglacial to orbital timescale, the U37-SSTs record in the JS correlated well with the benthic foraminiferal SO record and solar insolation, which suggests the dominant control of solar insolation and its related sea ice develop- ment on the SST in the JS. On the sub-orbital/millennial timescale, reduced SST corresponds to an enhanced east asian winter monsoon （EAWM） during the last glacial period （MIS3 and MIS4）, indicating the dominant control of sea ice expansion due to the enhanced EAWM on the SST in the JS. In contrast, during the last interglacial period （MIS5）, the SST in the JS was controlled by variations in the east Asian summer monsoon. These results highlight the key role of solar insolation and associated glacial-interglacial conditions in the variations of the SST in the JS since the last 170 ka.     

桃园钼矿床围岩蚀变特征及其研究意义

桃园钼矿床属中温热液脉型矿床，围岩蚀变具线型对称特征。蚀变以钾化与硅化和成矿关系最为密切。根据蚀变岩在空间上的分带特征与矿化强度之间的规律，可以确定成矿范围，指导找矿。     

陕甘川相邻区区域成矿规律及找矿模型

陕甘川相邻地区是我国重要的贵金属和有色金属成矿区，资源潜力巨大，金、铜、铅、锌为区内优势矿产，划分了主要矿床类型，总结了区域成矿规律，提出了“线一环结合，凹凸兼顾；区别矿种，着重类型；活用物化遥重异常”的找矿模型。     

伦理重构中的时代性与超越性——刘师培伦理道德思想析论

在中国近代资产阶级革命中,刘师培积极致力于中国近代伦理道德重构,批判改革“三纲之说”,倡导改良家族伦理,崇尚功利,追求自由、独立、平等的资产阶级伦理道德、体现了浓厚的时代性,转向无政府主义后,他又明确提出了根除家庭伦理、破“功利之谈”,倡导绝对平等的无政府主义伦理观,与前此迥然不同,具有明显的超前性。     

浅议知识经济时代及其对银行业的影响

21世纪,人类社会已经进入一个快速发展的知识经济时代。面对这一革命性的时代,我们应充分考虑到知识经济对银行业的影响。知识经济给银行带来的不仅仅是挑战,更多的是机遇。     

Response of the magnetic field and plasmas at the geosynchronous orbit to interplanetary shock

Interplanetary shock can greatly disturb the Earth＇s magnetosphere and ionosphere, causing the temporal and spatial changes of the magnetic field and plasmas at the geosynchronous orbit. In this paper, we use the magnetic field data of GOES satellites from 1997 to 2007 and the plasma data of MPA on the LANL satellites from 1997 to 2004 to study the properties of magnetic field and plasma （0.03-45 keV） at the geosynchronous orbit （6.6 RE） within 3 hours before and after the arrival of shock front at the geosynchronous orbit through both case study and superposed epoch analysis. It is found that following the arrival of shock front at the geosynchronous orbit, the magnetic field magnitude, as well as GSM Bzcomponent increases significantly on the dayside （8-16 LT）, while the By component has almost no change before and after shock impacts. In response to the interplanetary shock, the proton becomes much denser with a peak number density of 1.2 cm^-3, compared to the typical number density of 0.7 cm^-3. The proton temperature increases sharply, predominantly on the dusk and night side. The electron, density increases dramatically on the night side with a peak number density of 2.0 cm^-3. The inferred ionospheric O^＋ density after the interplanetary shock impact reaches the maximum value of 1.2 cm^-3 on the dusk side and exhibits the clear dawn-dusk asymmetry. The peak of the anisotropy of proton＇s temperature is located at the noon sector, and the anisotropy decreases towards the dawn and dusk side. The minimum of temperature anisotropy is on the night side. It is suggested that the electromagnetic ion cyclotron （EMIC） wave and whistler wave can be stimulated by the proton and electron temperature anisotropy respectively. The computed electromagnetic ion cyclotron wave （EMIC） intense on the day side （8--16 LT） with a frequency value of 0.8 Hz, and the wave intensity decreases towards the dawn and dusk side, the minimum value can be found on the night side. The computed electron whistler wave locates on the day side （8--16 LT） with a value of 2 kHz.     

青海昆仑山山口发现的细石器考古新材料

2009年考古学家在通往青藏高原腹地, 亦即藏北高原的昆仑山山口地区的野牛沟新发现了一处(海拔3800 m)早期人类活动细石器地点. 该地点尚有两处保存完好的火塘遗存, 对火塘灰烬进行AMS ¹⁴C测年, 其时代为7500 a BP左右, 这不仅意味着该地区细石器年代的确认, 同时也为普遍见诸青藏高原而又缺乏地层与断代的细石器地点提供了可靠的年代参照. 在火塘周边还发现一定数量的细石器, 包括细石核、石叶、刮削器以及用于加工石器的残石块. 石器的质料、组合以及类型等都反映出一定的权宜性, 结合火塘的临时性, 初步分析认为这是一处全新世早中期游动至此的、主要以采集狩猎为目的的随机性食物搜寻者的遗存.